Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves.

Aaccount for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been
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Bof the element iridium (originating deep within the earth), and of quartz
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Cthe element iridium (originating deep within the earth), and explain the presence of quartz having been
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Dthe presence of the element iridium (originating deep within the earth), and explain presence of quartz
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Eexplain the element iridium (originating deep within the earth), and the presence of quartz
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